Little Black Dress...I need help!

So I am searching for a little black dress....they are everywhere! But what to pick? They are either not right or too expensive. Want to help a girl out? Oh it's for a fairly casual wedding and I am a bridesmaid.

Here are a few I like, my sister (the bride) likes, or my husband likes. I am not sold on any really. :(

#1 Nordstrom

#2 Shabby Apple

#3 Nordstrom

Or #4 at Ann Taylor Loft, it wont let me copy the picture to share.

PLEASE Take a vote on #1,2,3 or 4.

Or maybe you have seen some super cute and cheaper little black dresses that you would like to share.